Hi Luka,
I donīt have a problem like yourīs as well, all rock-styles sound "normal" to me.
A few months ago I had a problem with the "^Apache" style, it sounded "garbled", but that was a problem with the corresponding audio-file. After I got a new one the problem was solved.
VERY OFTEN such (file-)problems are caused by the fact that people donīt use the "remove hardware / eject media" function from Windows.
EVEN if youīre using Win7 you MUST use it !
With "normal" devices ( such as USB-sticks ) simple unplugging works without any problems under Win-Vista and Win7, but not with the Audya !
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Greetings from East-Frisia ( Northern-Germany )